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首页> 外文期刊>Journal of Materials Engineering and Performance >Evaluation of Corrosion Susceptibility of Conventional Dual-Phase Steels Used in the Automotive Industry
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Evaluation of Corrosion Susceptibility of Conventional Dual-Phase Steels Used in the Automotive Industry

机译：汽车工业中使用的常规双相钢的腐蚀易感性评价

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摘要

Because of the high demand for dual-phase (DP) steels in the automotive and construction industry, the present investigation focused on evaluating the corrosion resistance of three different commercial DP steels through electrochemical corrosion tests in conventional media (0.5 M NaOH, 3.5 wt.% NaCl, and 0.5 M H(2)SO(4)solution). The potentiodynamic polarization test allowed us to determine the corrosion rate and the degradation mechanism as a function of DP steel type, test media, the amount of martensite fraction, and microstructure of DP steels. DP-270 steel presented a higher corrosion resistance in NaCl and H(2)SO(4)solutions compared with other DP steels. Moreover, DP-590 steel showed a higher corrosion resistance in NaOH solutions, while the DP-789 steel had the worst performance in NaOH and NaCl. Electrochemical impedance spectroscopy tests were performed to determine the charge-transfer resistance values from the Nyquist plots and review if DP steels followed the same tendency as the results that were obtained in the potentiodynamic polarization test, the mechanism of degradation was attributed to a charge-transfer. The microstructural characteristics of DP steels showed us that better corrosion resistance is related to a better distribution of the martensitic phase.
机译：由于汽车和建筑行业对双相钢（DP）的需求量很大，本研究的重点是通过常规介质（0.5 M NaOH、3.5 wt.%NaCl和0.5 M H（2）SO（4）溶液）中的电化学腐蚀试验，评估三种不同商业DP钢的耐腐蚀性。动电位极化试验使我们能够确定腐蚀速率和降解机制，这是DP钢类型、试验介质、马氏体分数和DP钢微观结构的函数。与其他DP钢相比，DP-270钢在NaCl和H（2）SO（4）溶液中具有更高的耐腐蚀性。此外，DP-590钢在NaOH溶液中表现出较高的耐腐蚀性，而DP-789钢在NaOH和NaCl溶液中表现最差。进行电化学阻抗谱测试，以确定奈奎斯特图中的电荷转移电阻值，并审查DP钢是否遵循与动电位极化测试中获得的结果相同的趋势，降解机理归因于电荷转移。DP钢的微观结构特征表明，更好的耐蚀性与更好的马氏体相分布有关。

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